This study consists of two parts: Part 1 and Part 2. The Part 1 is a single-center, randomized, 2-way crossover study that investigates the pharmacokinetics, safety, and tolerability of teriparatide after a single dose of AK159 (5 levels) and estimates the relative bioavailability of AK159 with subcutaneous teriparatide acetate in healthy post-menopausal women.